2 * Unix SMB/CIFS implementation.
3 * Utility functions to transfer files.
5 * Copyright (C) Jeremy Allison 2001-2002
6 * Copyright (C) Michael Adam 2008
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 3 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program. If not, see <http://www.gnu.org/licenses/>.
24 #include "transfer_file.h"
25 #include "lib/util/sys_rw.h"
27 /****************************************************************************
28 Transfer some data between two fd's.
29 ****************************************************************************/
31 #ifndef TRANSFER_BUF_SIZE
32 #define TRANSFER_BUF_SIZE 65536
36 ssize_t transfer_file_internal(void *in_file,
39 ssize_t (*pread_fn)(void *, void *, size_t, off_t),
40 ssize_t (*pwrite_fn)(void *, const void *, size_t, off_t))
46 size_t num_to_read_thistime;
47 size_t num_written = 0;
54 if ((buf = SMB_MALLOC_ARRAY(char, TRANSFER_BUF_SIZE)) == NULL) {
59 num_to_read_thistime = MIN((n - total), TRANSFER_BUF_SIZE);
61 read_ret = (*pread_fn)(in_file, buf, num_to_read_thistime, offset);
63 DEBUG(0,("transfer_file_internal: read failure. "
64 "Error = %s\n", strerror(errno) ));
74 while (num_written < read_ret) {
75 write_ret = (*pwrite_fn)(out_file, buf + num_written,
76 read_ret - num_written,
77 offset + num_written);
79 if (write_ret == -1) {
80 DEBUG(0,("transfer_file_internal: "
81 "write failure. Error = %s\n",
87 return (ssize_t)total;
90 num_written += (size_t)write_ret;
93 total += (size_t)read_ret;
94 offset += (off_t)read_ret;
98 return (ssize_t)total;
101 static ssize_t sys_pread_fn(void *file, void *buf, size_t len, off_t offset)
103 int *fd = (int *)file;
105 return sys_pread(*fd, buf, len, offset);
108 static ssize_t sys_pwrite_fn(void *file, const void *buf, size_t len, off_t offset)
110 int *fd = (int *)file;
112 return sys_pwrite(*fd, buf, len, offset);
115 off_t transfer_file(int infd, int outfd, off_t n)
117 return (off_t)transfer_file_internal(&infd, &outfd, (size_t)n,
118 sys_pread_fn, sys_pwrite_fn);